Easy Spot Welding Machine : 10 Steps (with Pictures) - Instructables

First what you need is the thing to which you want to do spot welding to.

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In this case ,i have used a lithium ion battery to which i am going to spot weld nickel alloy strips.

A low voltage high current source.In my case i have used a 2.7V 100F super capacitor which produces a maximum current of around 100 amperes.You can also use a 500F or above but it becomes difficult to the thing to which you are doing spot welding to from high current which melts the metals.

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You will need 2 thick copper conductors that can withstand the high currents produced during short circuit.You can get these from copper shading ring induction motors that are no longer of use.Thin copper conductors won't work and will melt easily.

A multi-meter to measure the voltage rise when you are charging the super capacitor to their rated voltage.U have go disconnect the charger as soon as the capacitor reaches its rated voltage or it will burst open after abnormal heating.

Touch one copper rod to the battery terminal and the other to the nickel alloy strip and then touch the nickel alloy strip to the battery terminal.The circuit will complete making a short circuit and creating a heating point high enough to melt and stick the 2 metals to each other.

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